1 files changed, 9 insertions, 0 deletions
diff --git a/packages/frontend/src/scripts/contains.ts b/packages/frontend/src/scripts/contains.ts
new file mode 100644
index 0000000000..256e09d293
--- /dev/null
+++ b/packages/frontend/src/scripts/contains.ts
@@ -0,0 +1,9 @@
+export default (parent, child, checkSame = true) => {
+	if (checkSame && parent === child) return true;
+	let node = child.parentNode;
+	while (node) {
+		if (node === parent) return true;
+		node = node.parentNode;
+	}
+	return false;
+};